Missing licence info added in pom file

- Added licence info to files that were missing it
- Fixed licence info to match with the creator of the file

Issue-ID: CPS-467
Signed-off-by: shivasubedi <shiva.subedi@est.tech>
Change-Id: I1c0eaedb2c87743a61a1cd58f33b0d0d04b3a977
diff --git a/checkstyle/pom.xml b/checkstyle/pom.xml
index 560fadd..3b7f3ed 100644
--- a/checkstyle/pom.xml
+++ b/checkstyle/pom.xml
@@ -1,4 +1,24 @@
 <?xml version="1.0" encoding="UTF-8"?>
+<!--
+  ============LICENSE_START=======================================================
+  Copyright (C) 2020 Pantheon.tech
+  ================================================================================
+  Licensed under the Apache License, Version 2.0 (the "License");
+  you may not use this file except in compliance with the License.
+  You may obtain a copy of the License at
+
+        http://www.apache.org/licenses/LICENSE-2.0
+
+  Unless required by applicable law or agreed to in writing, software
+  distributed under the License is distributed on an "AS IS" BASIS,
+  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+  See the License for the specific language governing permissions and
+  limitations under the License.
+
+  SPDX-License-Identifier: Apache-2.0
+  ============LICENSE_END=========================================================
+-->
+
 <project xmlns="http://maven.apache.org/POM/4.0.0"
          xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
          xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">